Wednesday 25th of April 2018
Important News
Iranian researchers improved the mechanical and metallurgical properties of welding joints by using nanoparticles
TEHRAN (INIC)- Iranian researchers from University of Tehran succeeded in increasing the mechanical and metallurgical properties of welding joints by using nanoparticles in friction stir welding method.
Results of the research can have applications in automotive, railways and
aerospace industries due to the wide applications of the joints in different
industries.
Although aluminum alloys are widely used, some joints of aluminum alloys have
limitations after the application of usual welding method. In addition, welding
joints usually have different properties from other parts of the object.
Therefore, researchers try to improve the performance of the joints.
The aim of the research was to improve the mechanical and metallurgical
properties of welding joints of two types of aluminum alloys with various
properties by using nanoparticles. Taking into consideration the improvement in
some mechanical and metallurgical properties of nanocomposite joints, these
joints have longer lifetime. Therefore, the maintenance and replacement of the
joints are carried out at longer intervals, which results in decreasing the
costs.
In this research, stir friction welding method has been used to join two
various types of aluminum alloys, one of which has significant corrosive
properties and the other one has a perfect ratio of strength to mass. Alumina
nanoparticles have been used in stir friction welding method to improve the
properties of the joints. The application of nanoparticles creates a
nanocomposite area in the welding zone, which contains an aluminum alloy phase
as the bed and alumina nanoparticles as the dispersed phase.
Comparison between test results of reinforced joints with nanoparticles and
regular ones shows that corrosion resistance, abrasion resistance and the
toughness of the reinforced joints have improved.
Results of the research have been published in Materials Research, vol. 18,
issue 6, 2015, 1156-1162.